Joint system for tubular framework or similar metal constructions



001.20, 1931. 3 VAN HATTUM 1,828,235

JOINT SYSTEM FOR TUBULAR FRAME WORK OR SIMILAR METAL CONS TRUCTIONS Filed Nov. 19, 1927 avvlwrag nrrarn/n STATES PATENT OFFICE ABE VAN HATTUM, OF THE HAGUE, NETHERLANDS J6EE FOR TUBULAR FRAMEWORK OB SWEAR METAL GUNSEELUQTEGNS Application filed. November 19, law, Serial No. 234,436, and in the Netherlands October is, 1927.

Joint system for tubular metal construc- Fig. 2 is a cross section on the line ll-11 tions are already mourn in which the tube in Fig. 1. ends at the joint are enclosed between two In Figs. 1 and 2, 1 is a junction-plate junction plates and are connected thereto by having lateral edges 9 and a longitudinal g; riveting or Welding, The invention relates edge 11, the two upper corners of said plate w to a joint system of another type in which being enclosed by the flattened. bifurcated use is made of metal tubes, provided at one opposite ends 30f a pair of aligned tubes 5, end or at both ends with flattened portions. each firmly secured to said. plate by three order to avoid the usual application of two rivets 7. The bottom 8 or each slot forming junction plat-es between which the tube ends said bifurcated ends abuts against one lateral 5 are located, and moreover, in order to obtain edge 9 of the plate 1, While the side Wall of considerable saving of material according said slots of the aligned tubes 5 abuts against to said type only a single junction plate is the longitudinal edge 11 of the plate 1. used the connection of this plate to the Each of said side Walls of slots are ex- 1 tubes is obtained by providing the flattened tended beyond both sides of the flattened end w portions of said tubes with forks embracing of the tubes so as to form a reinforcing transthe junction plate and the bottom of Which versal flange 10, the profile of the tube end abuts against one edge of said junction plate. obtaining thereby the l -shape shown in it follows that the flattened portions in this Fig. 2. 6 indicates two tubes provided with construction ere not enclosed between two known forks l embracing in the usual Way 65 junction plates but that a single junction the lower part of the plate 1 and therefore plate is enclosed by the forked or slotted tube abutting only on edge of said plate. end portions, The connection is then fin- The illustrated T shape of tube ends may ished by riveting or welding of the contractbe obtained in a simple manner by means or ing surfaces. According to the present inpunching machines, so that the new joint 70 vention, in order to reinforce this kind of system enables a strong and relatively inexconnection orjoint, said forked or slotted pensive metal construction to be obtained. end-portions of the tubes have U-shaped Although only a particular embodiment of v transversal profiles and are riveted to the the connection according to the invention has so corners of the junction plate so that a relative been illustrated, it will be clear that Within 5 angular pla of the junction plate and the the spirit of the invention modifications are tube is here y avoided possible and, for instance, the flattened por- 'lhe slot o each fork 18 thus closed not y tion need not to be provided with the rein- 5 m end Q but also dlong Q forcing flange 10, this depending upon the as of 1ts s1des and the closing W at either slde construction in which the connection is used. 5549 of the slot may be extended, so that re1nforc- What 1 claim is: i i i i j g i lg i 1. Joint system for tubular framework or an S 0 en Po Ion 6 e u e 0 ms similar metal constructions, comprising atua FF-shaped profile. b 1 b 1 1 1 7 it) The invention will be explained more fully u mem a P Y l P a 35 with reference to the drawings, showing slotted flat end on sand tubular member formen embodiment of the invention. mg two flat Q p m Walls embracing l is a front elevation of said embodi- 6011191 of sald Junctlon Pl f havmg ment of the joint system according to the in- U- p transverse and g1t d1na1 pr file vention While in order to abut two ad acent perpendicular 99 2 v Lana-ass edges of said plate and rivets for securing the joint. 7

2. Joint system for framework or similar metal constructions, comprising a tubular 5 member, a lygonal junction plate, a slotted flat on on said tubular member which forms two flat solid parallel walls embracing a corner of said junction plate and which have a U-shaped longitudinal profile and a 10 T-shaped transverse profile in order to abut two adjacent perpendicular edges of said plate andto reinforce the joint and rivets for securing said joint.

In testimony whereof I aflix my aig nature. ll ARIE vnr HA UM. 

